diff --git a/bugsnag.php b/bugsnag.php
index 2f71fe3..04fb6b4 100644
--- a/bugsnag.php
+++ b/bugsnag.php
@@ -9,6 +9,11 @@
 License: GPLv2 or later
 */
 
+use Bugsnag\Client;
+use Bugsnag\Handler;
+use Bugsnag\ErrorTypes;
+use Bugsnag\Report;
+
 class Bugsnag_Wordpress
 {
     private static $COMPOSER_AUTOLOADER = 'vendor/autoload.php';
@@ -21,10 +26,11 @@ class Bugsnag_Wordpress
         'url' => 'https://github.com/bugsnag/bugsnag-wordpress',
     );
 
-    private $client;
+    private Client $client;
     private $apiKey;
     private $notifySeverities;
     private $filterFields;
+    private $trackSessions;
     private $pluginBase;
 
     public function __construct()
@@ -32,10 +38,13 @@ public function __construct()
         // Activate bugsnag error monitoring as soon as possible
         $this->activateBugsnag();
 
+        // Start session tracking if enabled as early as possible
+        $this->maybeTrackSession();
+
         $this->pluginBase = 'bugsnag/bugsnag.php';
 
         // Run init actions (loading wp user)
-        add_action('init', array($this, 'initActions'));
+        add_action('init', array($this, 'registerUser'));
 
         // Load admin actions (admin links and pages)
         add_action('admin_menu', array($this, 'adminMenuActions'));
@@ -61,11 +70,13 @@ private function activateBugsnag()
             $this->apiKey = get_option('bugsnag_api_key');
             $this->notifySeverities = get_option('bugsnag_notify_severities');
             $this->filterFields = get_option('bugsnag_filterfields');
+            $this->trackSessions = get_option('bugsnag_track_sessions');
         } else {
             // Multisite
             $this->apiKey = get_site_option('bugsnag_api_key');
             $this->notifySeverities = get_site_option('bugsnag_notify_severities');
             $this->filterFields = get_site_option('bugsnag_filterfields');
+            $this->trackSessions = get_site_option('bugsnag_track_sessions');
         }
 
         $this->constructBugsnag();
@@ -75,13 +86,13 @@ private function constructBugsnag()
     {
         // Activate the bugsnag client
         if (!empty($this->apiKey)) {
-            $this->client = new Bugsnag_Client($this->apiKey);
+            $this->client = Client::make($this->apiKey);
 
             $this->client->setReleaseStage($this->releaseStage())
                          ->setErrorReportingLevel($this->errorReportingLevel())
-                         ->setFilters($this->filterFields());
+                         ->setRedactedKeys($this->filterFields());
 
-            $this->client->mergeDeviceData(['runtimeVersions' => ['wordpress' => get_bloginfo('version')]]);
+            $this->client->getConfig()->mergeDeviceData(['runtimeVersions' => ['wordpress' => get_bloginfo('version')]]);
 
             $this->client->setNotifier(self::$NOTIFIER);
 
@@ -96,8 +107,7 @@ private function constructBugsnag()
 
             if ($set_error_and_exception_handlers === true) {
                 // Hook up automatic error handling
-                set_error_handler(array($this->client, 'errorHandler'));
-                set_exception_handler(array($this->client, 'exceptionHandler'));
+                Handler::register($this->client);
             }
         }
     }
@@ -105,7 +115,7 @@ private function constructBugsnag()
     private function requireBugsnagPhp()
     {
         // Bugsnag-php was already loaded by some 3rd-party code, don't need to load it again.
-        if (class_exists('Bugsnag_Client')) {
+        if (class_exists('Bugsnag\Client')) {
             return true;
         }
 
@@ -142,7 +152,7 @@ private function errorReportingLevel()
 
         $severities = explode(',', $notifySeverities);
         foreach ($severities as $severity) {
-            $level |= Bugsnag_ErrorTypes::getLevelsForSeverity($severity);
+            $level |= ErrorTypes::getLevelsForSeverity($severity);
         }
 
         return $level;
@@ -177,36 +187,38 @@ private function releaseStage()
         return $release_stage_filtered;
     }
 
-    // Action hooks
-    public function initActions()
+    private function maybeTrackSession()
     {
-        // This should be handled on stage of initializing,
-        // not even adding action if init failed.
-        //
-        // Leaving it here for now.
-        if (empty($this->client)) {
+        if(!checked($this->trackSessions, true, false)) {
             return;
         }
 
-        // Set the bugsnag user using the current WordPress user if available,
-        // set as anonymous otherwise.
-        $user = array();
-        if (is_user_logged_in()) {
-            $wp_user = wp_get_current_user();
+        $this->client->startSession();
+    }
 
-            // Removed checks for !empty($wp_user->display_name), it should not be required.
-            $user['id'] = $wp_user->user_login;
-            $user['email'] = $wp_user->user_email;
-            $user['name'] = $wp_user->display_name;
-        } else {
-            $use_unsafe_spoofable_ip_address_getter = apply_filters('bugsnag_use_unsafe_spoofable_ip_address_getter', true);
-            $user['id'] = $use_unsafe_spoofable_ip_address_getter ?
-                $this->getClientIpAddressUnsafe() :
-                $this->getClientIpAddress();
-            $user['name'] = 'anonymous';
-        }
+    // Action hooks
+    public function registerUser()
+    {
+        $this->client->registerCallback(function(Report $report) {
+            // Set the bugsnag user using the current WordPress user if available,
+            // set as anonymous otherwise.
+            $user = [];
+
+            if (is_user_logged_in()) {
+                $wp_user = wp_get_current_user();
+                $user['id'] = $wp_user->user_login;
+                $user['email'] = $wp_user->user_email;
+                $user['name'] = $wp_user->display_name;
+            } else {
+                $use_unsafe_spoofable_ip_address_getter = apply_filters('bugsnag_use_unsafe_spoofable_ip_address_getter', true);
+                $user['id'] = $use_unsafe_spoofable_ip_address_getter ?
+                    $this->getClientIpAddressUnsafe() :
+                    $this->getClientIpAddress();
+                $user['name'] = 'anonymous';
+            }
 
-        $this->client->setUser($user);
+            $report->setUser($user);
+        });
     }
 
     // Unsafe: client can spoof address.
@@ -256,12 +268,14 @@ private function updateNetworkSettings($settings)
         update_site_option('bugsnag_api_key', isset($_POST['bugsnag_api_key']) ? $_POST['bugsnag_api_key'] : '');
         update_site_option('bugsnag_notify_severities', isset($_POST['bugsnag_notify_severities']) ? $_POST['bugsnag_notify_severities'] : '');
         update_site_option('bugsnag_filterfields', isset($_POST['bugsnag_filterfields']) ? $_POST['bugsnag_filterfields'] : '');
+        update_site_option('bugsnag_track_sessions', isset($_POST['bugsnag_track_sessions']) ? $_POST['bugsnag_track_sessions'] : '');
         update_site_option('bugsnag_network', true);
 
         // Update variables
         $this->apiKey = get_site_option('bugsnag_api_key');
         $this->notifySeverities = get_site_option('bugsnag_notify_severities');
         $this->filterFields = get_site_option('bugsnag_filterfields');
+        $this->trackSessions = get_site_option('bugsnag_track_sessions');
 
         echo '<div class="updated"><p>Settings saved.</p></div>';
     }
@@ -289,14 +303,16 @@ public function testBugsnag()
         $this->notifySeverities = $_POST['bugsnag_notify_severities'];
         $this->filterFields = $_POST['bugsnag_filterfields'];
 
-        $this->constructBugsnag();
         $this->client->notifyError(
             'BugsnagTest',
             'Testing bugsnag',
-            array(
-                'notifier' => self::$NOTIFIER,
-                'docs' => array('url' => 'https://docs.bugsnag.com/platforms/php/wordpress/'),
-            )
+            function (Report $report) {
+                $report->setSeverity('info');
+                $report->setMetaData([
+                    'notifier' => self::$NOTIFIER,
+                    'docs' => array('url' => 'https://docs.bugsnag.com/platforms/php/wordpress/'),
+                ]);
+            }
         );
 
         die();
@@ -346,7 +362,7 @@ public function __call($method, $arguments)
             return call_user_func_array(array($this->client, $method), $arguments);
         }
 
-        throw new BadMethodCallException(sprintf('Method %s does not exist on %s or Bugsnag_Client', $method, __CLASS__));
+        throw new BadMethodCallException(sprintf('Method %s does not exist on %s or Bugsnag\Client', $method, __CLASS__));
     }
 }
 
diff --git a/composer.json b/composer.json
index 057b7bd..544eb53 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "bugsnag/bugsnag-wordpress",
     "type": "wordpress-plugin",
     "require": {
-        "bugsnag/bugsnag": "^2.10.2",
+        "bugsnag/bugsnag": "^3.30.0",
         "composer/installers": "^1.0"
     },
     "license": "MIT",
diff --git a/views/settings.php b/views/settings.php
index 9fe7182..4d5f233 100644
--- a/views/settings.php
+++ b/views/settings.php
@@ -70,6 +70,20 @@
                         </p>
                     </td>
                 </tr>
+
+                <!-- Track Sessions -->
+                <tr valign="top">
+                    <th>
+                        <label for="bugsnag_track_sessions">Track Sessions</label>
+                    </th>
+                    <td>
+                        <input type="checkbox" id="bugsnag_track_sessions" name="bugsnag_track_sessions" value="1" <?php checked($this->trackSessions, true); ?> />
+                        <p class="description">
+                            Enable automatic session tracking to monitor stability metrics in your BugSnag dashboard.
+                            <br> Read more about <a href="https://docs.bugsnag.com/product/stability/" target="_blank">stability metrics</a>.
+                        </p>
+                    </td>
+                </tr>
             </table>
 
             <div class="submit">